opinions please

[chunkyr8]

i want to do the exhaust in the next few weeks but i am not sure which way to go 2.5" or 3". i am mainly after the sound, power gains are a bonus, the only other mods i plan on doing are cai and tune.

there is so much info out there and ppl seem happy with both systems.

so please guys tell me honestly what you think is the best way to go. :)

[Veeate]

The twin 3" on these LS2 engines are fantastic. The sound is awesome.

I have the twin 3", plus pacies , otr and tune and it is a very nice combo. Great sound and good power.

Go see one of the forum sponsors like Castle Hill Exhaust and you can't go wrong.

[chunkyr8]

The twin 3" on these LS2 engines are fantastic. The sound is awesome.

I have the twin 3", plus pacies , otr and tune and it is a very nice combo. Great sound and good power.

Go see one of the forum sponsors like Castle Hill Exhaust and you can't go wrong.

do you mind me asking where you got your system from, is it custom made

do you think that the otr is better than cai

forgive me but i dont know alot about cars but i am learning, being a girl is probably a bit of a setback when it comes to cars.... lol

[Veeate]

All my work has been done at Castle Hill Exhaust (CHE). Dale or any of the guys at CHE would be happy to help you and answer any questions.

The merits of cai vs otr and maf vs mafless etc are all there in other threads.

What i will say is that the combo CHE put together for me and plenty of others is tried and tested and gets great results. I did the full exhuast first and then the otr plus tune later.

If you are after sound then try the full exhaust system first. You won't be disappointed. As you said the bonus will be the 25-30rwkw you pick up !

[chunkyr8]

thanks veeate

i will call them today, i was thinking of having it all done at the same time
so i will see what they recommend

[drg86]

You can't have an OTR on a VE due to the different design. A CAI system has been developed for the VE so you can get one of these. There's plenty of info on the forum about these.

As for the exhaust I'd go a twin 3" if funds allow. I found with my exhaust when I put the extractors on it produced a much better sound.

[chunkyr8]

Thanks drg86

CAI it is then, the exhaust is definitely going to be 3" i'm not so much concerned about cost, i's the sound and quality that i'm after.

[SS Enforcer]

You allready have a good set of headers on that car just get a x-force cat back and it will sound fantastic. Kpm did a complete system for the HSV ls2 in the Ve and picked up bugger all power. The cat back will be perfect leaving some $$ to finish it off with a tune. Good luck with it.

cheers

[VX2VESS]

twin 3" is enough for a turbo, N/A 2.5 should be sufficient.

[ssgirl2]

...the exhaust is definitely going to be 3" i'm not so much concerned about cost, i's the sound and quality that i'm after.

There's been alot of discussion of late relating to this (as you know) and personally in my non-mechanical opinion :D, and purely from reading too much, I think a 2.5" x-force cat back would be your best bet to start with - if you don't want to go crazy! Belz-v8 is really happy with her x-force, although she did get the full system and induction, so if you haven't already, perhaps you could send her a PM to find out why she went the way she did.

SS :)

[chunkyr8]

I will pm belzv8 now thanks kirst

hopefully she can help me out.

[fastestls7]

give sonny a buzz @ marranos. from what ive seen there is stuff all power increase in th ls2 ve r8 with full exhaust. mayb just an option to put two rear hotdogs for around $400 that will change the sound or your ride. my boss did it on his ve ssv L98. sounds pretty good for stuff all money.

i on the other hand went to kpm in adelaide for a full 3 in system, cai and custom tune making 268.7 rwkw. they will freight you a system and get it fitted at your local mech.

[DuffMan]

Exactly how many of you people who reccomend x-force twin 2.5" systems have one or have actualy heard one?

I ask this because everyone on this forum who mentions them says they're great, yet my twin 2.5" mild steel system is not loud at all and in my opinion sounds crap (It will be making way for a sureflo system in the very near future).

Do x-force make different types (louder/quieter) or what? If they are all like mine then i wouldn't reccomend them to anyone.

[michaels1v8]

Exactly how many of you people who reccomend x-force twin 2.5" systems have one or have actualy heard one?

I ask this because everyone on this forum who mentions them says they're great, yet my twin 2.5" mild steel system is not loud at all and in my opinion sounds crap (It will be making way for a sureflo system in the very near future).

Do x-force make different types (louder/quieter) or what? If they are all like mine then i wouldn't reccomend them to anyone.

Is that with extractors?

[BLACK 346]

Exactly how many of you people who reccomend x-force twin 2.5" systems have one or have actualy heard one?

I ask this because everyone on this forum who mentions them says they're great, yet my twin 2.5" mild steel system is not loud at all and in my opinion sounds crap (It will be making way for a sureflo system in the very near future).

Do x-force make different types (louder/quieter) or what? If they are all like mine then i wouldn't reccomend them to anyone.

Wise choice Duff, x-force, Redback, deffillipo, all the twin systems
on LS1 sound pretty much the same imo, single 3.5 gives that
deeper note that I always yearned for.

[DuffMan]

Is that with extractors?

Nope, just the cat back. It was fitted for free by the dearership so i did't expect much but a little noise would have been nice.

[BLACK 346]

Nope, just the cat back. It was fitted for free by the dearership so i did't expect much but a little noise would have been nice.

Headers will make a difference to the note, but you wont get the
deep thumping sound of the Sureflo 3.5 from a twin 2.5.

[DuffMan]

Headers will make a difference to the note, but you wont get the
deep thumping sound of the Sureflo 3.5 from a twin 2.5.

I'm not after the best sounding/loudest exhaust out there. Just something that doesn't get shown up by my 2 stroke lawnmower which im sorry to say, the x-force does in both volume and quality:rofl:

As i said before, if all the x-force systems are pretty much the same then i am at a loss as to why people talk them up.

[michaels1v8]

I'm not after the best sounding/loudest exhaust out there. Just something that doesn't get shown up by my 2 stroke lawnmower which im sorry to say, the x-force does in both volume and quality:rofl:

As i said before, if all the x-force systems are pretty much the same then i am at a loss as to why people talk them up.

Exhaust would probably be 100% better with headers. They make a huge difference to noise sound and level. I too have a redback (fitted by dealer also) catback and it is pretty quiet but Im hoping with extractors it will do me for a while until I get a sureflow 3 1/2 exhaust. They sound awesome... Even with out headers they make a great note and some good noise levels.

I would try extractors first on your system and see how it goes. Then if it isnt loud or DEEP enough go the sureflow :thumbsup:



Chunky R8 I would go the twin 3 inch. The do sound awesome on the LS2s and many people would agree! Go a good quality one though because drone is a bitch. Check out Sureflow (Forum Sponser) they are the experts on making drone free exhaust systems.

[SV346]

2.5 systems are more suited to the 5.7's, and become slightly restrictive on the 6L's though, so its best to go with a twin 3 as these have good proven power, and mixed with a big set of headers are perfect. Go the twin 3!!! Youl love the sound too!

[BLACK 346]

Exhaust would probably be 100% better with headers. They make a huge difference to noise sound and level. I too have a redback (fitted by dealer also) catback and it is pretty quiet but Im hoping with extractors it will do me for a while until I get a sureflow 3 1/2 exhaust. They sound awesome... Even with out headers they make a great note and some good noise levels.

I would try extractors first on your system and see how it goes. Then if it isnt loud or DEEP enough go the sureflow :thumbsup:



Chunky R8 I would go the twin 3 inch. The do sound awesome on the LS2s and many people would agree! Go a good quality one though because drone is a bitch. Check out Sureflow (Forum Sponser) they are the experts on making drone free exhaust systems.


Wishful thinking mate, the headers will not improve a Redback 100%,
they will improve it a little though. Will give it a tad more of that
V8 note. Been there done that.


2.5 systems are more suited to the 5.7's, and become slightly restrictive on the 6L's though, so its best to go with a twin 3 as these have good proven power, and mixed with a big set of headers are perfect. Go the twin 3!!! Youl love the sound too!

Twin 2.5 restrictive on a 6 point 0? You really think that is true?

[Gen-erous]

One of my mates recently got the 3" and doesn't regret a cent.

[davejaff]

Bigger isnt always better...well in tech talk anyway!

[Justice R8]

2.5 systems are more suited to the 5.7's, and become slightly restrictive on the 6L's though, so its best to go with a twin 3 as these have good proven power, and mixed with a big set of headers are perfect. Go the twin 3!!! Youl love the sound too!

Can you please post up some of your testing that proves the facts that you have quoted. Some back pressure numbers showing the amount of restriction would be good. If your testing shows any major backpressure I would suggest you look for a blocked cat or a blocked muffler ie broken internally as a 2.5 system is plenty for a 5.7 or a 6.0L. We are talking 300cc difference yet everyone thinks we need to fit drainpipes to expell the gasses.

Guys with standard cars. I will say it again, buy a system you like the sound of as that is what you are buying. The performance gains are minimal and genelly any large gains shown by fitting an exhaust are usually only seen when fitted to an untuned car due to how the standard tune is functioning at the time of the test. There are so many variables that people can do to show a big gain that you wont see when the car has been tuned before and after the exhaust is fitted. A 6ltr does not require 3 inch systems to make power.

[BLACK 346]

Can you please post up some of your testing that proves the facts that you have quoted. Some back pressure numbers showing the amount of restriction would be good. If your testing shows any major backpressure I would suggest you look for a blocked cat or a blocked muffler ie broken internally as a 2.5 system is plenty for a 5.7 or a 6.0L. We are talking 300cc difference yet everyone thinks we need to fit drainpipes to expell the gasses.

Guys with standard cars. I will say it again, buy a system you like the sound of as that is what you are buying. The performance gains are minimal and genelly any large gains shown by fitting an exhaust are usually only seen when fitted to an untuned car due to how the standard tune is functioning at the time of the test. There are so many variables that people can do to show a big gain that you wont see when the car has been tuned before and after the exhaust is fitted. A 6ltr does not require 3 inch systems to make power.


Bit like a dyno figure though isn't it, sounds heaps better when
your shooting the mouth off if you have a twin 3 inch rather than
the poor old twin 2.5 :)

[jaykay]

Thanks drg86

CAI it is then, the exhaust is definitely going to be 3" i'm not so much concerned about cost, i's the sound and quality that i'm after.
If you want the sound go the 3". I've heard Kel's full 2.5" X Force system and a catback 2.5" X Force on another R8 and for me they are too quiet...


A 6ltr does not require 3 inch systems to make power.
Maybe not for power but for note it does. What do we get then that has a hot note for the L98 in 2.5" ? The VE's for some reason because of the drone issue the notes are quiet compared to the previous systems for the Gen III's....

[michaels1v8]

Wishful thinking mate, the headers will not improve a Redback 100%,
they will improve it a little though. Will give it a tad more of that
V8 note. Been there done that.


Yes I suppose not 100% but Duffman said he was not after the best sounding note or the loudest, just a not half bad, louder note than what he has got now. Extractors should definately make it louder and give it a nicer note so yeah I would say that is a improvement. Your right though. Wont be 100% better but it definately wont get shown up by your lawnmower...:jester:

[chunkyr8]

Exhaust would probably be 100% better with headers. They make a huge difference to noise sound and level. I too have a redback (fitted by dealer also) catback and it is pretty quiet but Im hoping with extractors it will do me for a while until I get a sureflow 3 1/2 exhaust. They sound awesome... Even with out headers they make a great note and some good noise levels.

I would try extractors first on your system and see how it goes. Then if it isnt loud or DEEP enough go the sureflow :thumbsup:



Chunky R8 I would go the twin 3 inch. The do sound awesome on the LS2s and many people would agree! Go a good quality one though because drone is a bitch. Check out Sureflow (Forum Sponser) they are the experts on making drone free exhaust systems.

thanks for that :):)

it is very difficult to hear the sounds properly on some of the sound clips, i'm after the loud note so thats why i don't want to spend the $$ on 2.5" and then regret it becaust it is not loud enough, then to only have to replace it with 3" . i only want to do it once and do it right the first time.

[SS Enforcer]

Ask Oztrack what a GTS with a set of difillipos and x force 2.5 cat back..... sounds like says it sounded awesome.

cheers

[chunkyr8]

well decision has been made

the R8 is going in this thursday to get cai, 3" custom made zorst with 1 3.4" pacemaker headers and dyno.

cant wait :dancenana:

[drg86]

Very nice, that will sound great. You won't use your radio/cd player for weeks after it :D

[VXRacer]

Nice choice.. After hearing some VE's the other week on the dyno I definately think that the twin 3" is the way to go...

[zeeute]

Wow this should sound good!

[michaels1v8]

well decision has been made

the R8 is going in this thursday to get cai, 3" custom made zorst with 1 3.4" pacemaker headers and dyno.

cant wait :dancenana:

Good choice mate.
Exactly what I would of done if I was you

[Curtis-R]

well decision has been made

the R8 is going in this thursday to get cai, 3" custom made zorst with 1 3.4" pacemaker headers and dyno.

cant wait :dancenana:

Good luck with it ChunkyR8.. Personally i would have pushed you the X-Force headers way, but I am sure that combo should be sweet. I've seen a number of X-Force systems on a few VE's now and they are a very nice setup with very good results in power. Try and make sure you get a system with a merge in it ;) (unless you want the drone symptoms)

[chunkyr8]

No...no drone had a good chat to the guys first, they said it will be sweet and should be no drone.

Getting it done at CHE....cant wait

[VESSWA]

No...no drone had a good chat to the guys first, they said it will be sweet and should be no drone.

Getting it done at CHE....cant wait

As it's a custom set-up you are entitled to ask for a gaurantee that you'll be happy with the result, similar to what EXCESSV and I were offered here from APC. If they are confident in there system they should come to the party. The worse that can happen is they have to modify it with extra resonators or something to quieten it or take out/reduce any drone which is not a big deal. Drone is the big problem with aftermarket VE systems I'm told.

Your choice is similar to what I've got and I think you'll be very happy. :)

[chunkyr8]

I'll talk to them about a guarantee when I get there...thanks for that

They seem to know what they were talking about and have done a few and said that auto's have a drone problem moreso than the manual, we have a manual so hopefully it will be ok, and being a forum sponser I'm sure they'll do a great job.

what system do you have

[VESSWA]

I'll talk to them about a guarantee when I get there...thanks for that

They seem to know what they were talking about and have done a few and said that auto's have a drone problem moreso than the manual, we have a manual so hopefully it will be ok, and being a forum sponser I'm sure they'll do a great job.

what system do you have

Pacemaker 4/1
3 inch merged mandrel bent intermediate with a 2.5 inch rear section
Magnaflow 3 inch cats
Extra set of resonators

This would be their recommended auto version but mine is a manual. I wanted to quieten it a bit so the extras resonators were put in (as they would an auto). They have done a lot of systems and combinations and it may seem weird going back to 2.5 inch at the rear but "to get the best power gains without forced induction happening later, better to have some extra back pressure to keep the torque curve consistent right throughout the rev range". It sounds awseome and have plenty more grunt and no/negligible drone.:dance:

[chunkyr8]

sounds like a good system you have...awesome sound thats what i want with a deep note

The guy's told me with all that i am having done it should pull around 280kw at the back wheels....doing before and after with the dyno so i will post the details when its finished